It was said Marvel Studios wanted both of them for their upcoming movies, but nothing specific was mentioned.

While the deal did not end up going through - it's been further said that the Marvel Studios and Fox deal wasn't about characters, but about money - the Silver Surfer and Galactus may have been wanted for the Guardians of the Galaxy movie.

Inside News: Marvel wanted the rights to Silver Surfer and Galactus for Guardians of the Galaxy.

Of course the tweet could be complete nonsense, but the inclusion of the Silver Surfer and Galactus brings with it an interesting aspect to the Guardians of the Galaxy movie in that the two characters are major powerhouses of the Marvel U. Now, they could have just made a brief cameo, a set up for further movies, or they could have been fully involved.

I can think a few different comic book related possibilities where they would fit with the Guardians of the Galaxy: An Infinity Gauntlet scenario, an Annihilation scenario, or has been previously rumored — a Thanos Imperative scenario.